Effect of Interval to Resynchronization of Ovulation on Fertility of Lactating Holstein Cows when Using Transrectal Ultrasonography or a Pregnancy-Associated Glycoprotein Enzyme-Linked Immunosorbent Assay to Diagnose Pregnancy Status.
Journal of Dairy Science（2009）
Key words
resynchronization,transrectal ultrasonography,pregnancy-associated glycoprotein
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